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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829989c869b6e29a9dad31d78d7e55b1cb1d39f0ed445f60efc7cf5c18312ea2' 
  AND token = 'Z7BC+9uOlg4Ri9AGRP61Hm9kItyD0RJqn1RZ9CXX798=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}